Bolt-anchor.



O. JOSEPH.

BOLT ANCHOR.

APPLIOATION FILED MAR. 29. 1012.

Patented July 8, 1913.

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Specification of Letters Patent.

Patented July 8,1313,

Application filed March 29, 1 9158. Serial No. 637,158.

To all whom it may concern Be it known that I, CARL JOSEPH, a subject of the German Emperor, residing at Bayonne, in. the county of Hudson and State of New Jersey, have invented certain new and useful Improvements in Bolt-Anchors,-of which the following is a specification.

This invention relates to bolt anchorsand its novelty consists in the construction and adaptation of the parts, as will be more fully pointed out hereinafter.

In the drawings, Figure 1 is a side view of a bolt anchor embodying the invention; Fig. 2 is a transverse section of the same on the plane of the line 2-2 in Fig. 1; Fig. 3 is a similar section on the plane of the line 3-3 in Fig. 1; Fig. 4 is a similar section on the plane of the line 4-4 in Fig. 1; Fig. '5 is a longitudinal section showing a screw hook inserted and the bolt anchor expanded; Fig. 6 is a longitudinal section of the bolt anchor before expansion; Fig. 7 is a plan of the blank out of which the anchor is formed; and F ig. 8 is a view of the blank partly formed into the anchor.

In the drawings, 10 is the body portion of a bolt anchor formed by any suitable means into a substantially cylindrical shape.

Extending longitudinally. and inwardly from such body, andpreferably formed in: tegr'al therewith, are a series of segments 11 flaring and tapering inwardly so that they are wider at their outer ends 12 than at their inner ends where they join the tubular body portion 10. Each segment 11 is folded along its center line 13 so that its edges 14 are maintained at substantially the same distance apart radially from the imaginary axis of the cylindrical body of the finished device. Thus, the creased or folded portion is deepest at its free end and shallowest at the place where it joins the tubular body 10. In effect, when formed, the outer portion of the device presents externally the appearance of a tubular body with tapering longitudinal depressions for a portion of its length, while internally .the body is substantially conical.

The edges 14 of each segment 11 are preferably serrated. or notched, and the bent or folded portion is scored or provided with indentations 15 preferably arranged in spiral relation so that they will aptly engage the threads of the bolt or screw 16 to be inserted in the device.

The device is preferably formed out of the blank illustrated in'Figs. 7 and 8, This blank is preferably stamped out of a single piece. of suitable metal. It is then bent over into the form shown each segment being simultaneously creased and scored, an intermediate position being shown in Fig. 8.

In use, the bolt anchor is first inserted as a tubular body in a cylindrical aperture formed to receive it in the wall into which it is to be inserted (see Fig. 5). A screw or bolt 16 is then inserted and rotated and, as it is rotated, the anchor gradually expands and tightly holds the screw in position.

What I claim as new is:

1. A bolt anchor, comprising a sheet metal tubular open-ended body and a segment projecting longitudinally beyond one end of the same, being of sheet metal andintegrally connected to the body, said segment having its outer portion substantially in line with the body and having a portion inset into line with the bore of the body.

2. A bolt anchor, comprising a sheet metal tubular open-ended body and at least three independent radially separable segments of sheet metal projecting longitudinally from one end of the body, said segments having their outer portions substanin Fig. 1,

tially in line with the body and having 1011- gitudinally disposed inset portions that are disposed in line with the bore of the body.

3. A bolt anchor, comprising a tubular open-ended body and a plurality of seg-' ments projecting from one end of the same, said segments having longitudinally disposed anchoring edges normally located in substantial alinen ent with the body walls and having their longitudinal intermediate portions inset to form atapered throat in line with the bore of the body. 1. A bolt anchor, comprising a tubular open ended body and a plurality of segments projecting from one end of the same, said segments tapering toward the body and having longitudinally disposed anchorin edges normally arranged in substantia'.

alinement with the body, said segments furthermore having their longitudinal intermediate portions inwardly contracted portion in line with the bore of the body.

5. A bolt anchor, comprising a tubular open ended body and a plurality of segments projecting. from oneehd of the same,

creased to form-a said segments oing iong'iih:Mizmfiy wardly crmsod, sold creases 121 at ihe free ends of the sag-moms ends adjacent 0 the body, m

' 7 5 having their egos Gisposwd $1.2Mmnuiz'aily parallel totho body Waiisimd in iiao 5219 5* with.

6. A 1001i; anchor, comprising a 0 formed of an open-ended sea-Xmas 10 metal tube and a pluraii'ty 0:? indo radially se mrable anciaoring so goofing $770111 0m and out: the s( tegra]; thorevnth.

7. As an article of manufactmo o ooh;

33y wzpiied tabular body portion @1101 7 lon 'viudinai rejecting segments 21$; kiwi; ore inwardly oo-ncaved and min width toward the body portion, :1; of said. sogments being outset and 3 $119 inner faces being 'fizmns m3 uosfmgaiod in form screw thread in :pYQStiHGQ a; two witnesses.

CL KRL JQSEPH.

ALAN. (l lJODiHWELL,

EDNA A. Tfivic RELAND, 

